Good morning Keith,
I'm Doug, and I'm very sorry to hear of your brother's situation.
Under the circumstances, you will need to file a Petition with the court to be Appointed his Legal Guardian and Conservator of his Estate. When you are granted the Letters of Guardianship by the court, you will be legally allowed to act in his place in all matters relating to his health and well being as well as his finances. While the authority granted you lasts a bit longer than one year, it is easily renewed so that you may continue to act on his behalf into the future with no interruption.
You will need to have a Probate attorney in the county where your brother is presently residing file your petition with the court. The fee of $3,000 that you mentioned is a reasonable fee for the work that must be done in this instance.
Here is a good article on Guardianships in Texas, and I'm sure you will find some helpful information in this article: http://www.texasbar.com/Content/NavigationMenu/ForThePublic/FreeLegalInformation/FamilyLaw/ProtectingtheIncapacitatedAGuidetoGuardianshipinTexasfromApplicationtoOath.pdf
You may reply back to me using the Continue the Conversation or Reply to Expert
link if you have additional questions; and if you do, I ask that you please keep in mind that I do not know what you may already know or with what you need help, unless you tell me. Please remember to press the smiley faces/stars on the right of your screen when we are finished with our communication so I will be credited for my time in assisting you.
Kindly remember to ONLY rate my answer when you are fully satisfied. If you feel the need to rate anything less than OK, please stop and contact me with whatever issue or clarification you may need. I will be happy to continue further and assist you until I am able to address your concerns to your satisfaction.
I wish you the best in 2012,